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The Audi TT equipped with the 2.0 TFSI engine has a timing chain on the base TT model, while the TTS model features a timing belt. Personally, I believe having a timing chain is preferable to a belt since it eliminates the need for replacement. Typically, timing belts need to be changed every 60,000 to 100,000 miles, whereas timing chains can last up to 300,000 miles. It's still recommended to inspect your chain annually to ensure it's not loose, as this could signal an issue with the tensioner that requires replacement.
The Audi TT 2.0 TFSI comes equipped with a timing chain instead of a timing belt.
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I own a 2009 TTS with a belt.
The vehicle is equipped with a timing chain rather than a timing belt. I am unsure of the specific year model.